Let me make sure I understand -- if a person has a True Blue account, he/she will get automatically credited for the difference if a booked ticket has a fare decrease. Correct? If so, then is this done irreguardless as to what point balance he/she does or does not have? And furthermore, if a person does NOT have a True Blue account, then what options does he/she have for getting a credit for a booked ticket that decreased in cost after purchase?

What I am getting at is -- is joining True Blue for the crediting of fare decreases reason enough for joining, even if a person does not anticipate flying True Blue enough to ever earn 100 points during a year's time?